Construction of the longest tunnel in Changyi Changcheng high speed railway

On October 26, the entrance of gongjiacun tunnel in the Yiyang section of Changyi Changyang high speed railway, which was constructed by Shanghai Railway Bureau, officially entered the tunnel, marking that the construction of the main body of the longest tunnel in the whole Changyi Changyang railway was fully started. The total length of the tunnel is 1608.49m, with many faults, complex surrounding rock, difficult construction, tight construction period, heavy task and high safety risk. It is the key control project of the whole line. Since entering the site, in order to build the Changyi long railway safely, high quality and quickly, the construction unit has carefully organized and selected a tunnel operation team with rich construction experience, huge team strength and high degree of specialization to carry out the construction of all working faces. At the same time, the original design of the tunnel as the "inlet + outlet" excavation method has been innovated as the "outlet + 2 open tunnel two-way excavation" excavation method, taking three measures. The working face shall be constructed to ensure the quality and quantity of the control project to be completed on time. Photo by Zhang Gang and Zhao Jun